Custom-made Zirconia Crowns Versus Prefabricated Zirconia Crowns in Young Permanent Molars: A Randomised Controlled Trial

Young permanent molars presenting with gross caries, pulpal treatment or developmental defects often require full coverage restorations. Recently, the Prefabricated Zirconia Crowns (PZCs) have been introduced as a biocompatible and an aesthetically pleasant option with promising outcomes. However, it comes in specific sizes, limited shades and a significant tooth preparation is often required. Custom-made zirconia crowns (CZCs), fabricated using CAD/CAM technology may; offer a favorable aesthetic alternative by ensuring a controlled tooth reduction, precise fit, better aesthetics, and improved retention. Nevertheless, the current evidence concerning its use in young permanent molars remains limited. This study will be a randomised clinical trial that aims to compare the clinical performance of (PZCs) with that of (CZCs) for the restoration of badly carious/destructed young permanent molars in children aged 7-13. Patients will be randomised into two treatment groups using an online block randomisation technique (block size of 6) and sealed-envelope techniques. Clinical parameters: retention, fracture, gingival health and marginal integrity will be evaluated at 3-month, 6-month, and 12-month intervals. In addition, treatment duration, intraoperative patient comfort and immediate postoperative patient satisfaction will be evaluated and compared. The findings of this study are expected to provide evidence on the suitability of CZC for young permanent molars in children. The Null hypothesis is that there is no difference between the two types of crowns in terms of clinical performance and child acceptance.